150 



LUTEINE. 



served in the same position as those of the 

 chloroform solution of ovario-luteine. 



AaBC 



HH' 



Spectrum of cysto-luteine. 



V. Sero-luteine. 



1. Allow blood to stand, and decant the serum. 

 Set aside the latter to deposit, pour off the 

 liquid, and filter it through paper repeatedly 

 till clear. Before the spectroscope it will show 



AaBC 



Eb 



Spectrum of sero-luteine. 



the bands of hematocrystalline (q. v.\ and also 

 (probably) one band and a doubtful second, 

 corresponding to the ovario-luteine bands. If 

 diluted till the blood bands disappear the 

 luteine bands will also become invisible. 



VI. Intestino-luteine, from Infants. 



1. Mix the yellow faeces of sucking infants with 

 alcohol in excess, filter from the flakes of 



